Wednesday, 14 July 2010

The relationships between fabric parameters and yarn run-in (yarn consumption) is an extremely important factor for production planning.This data allows the knitter to estimate his yarn requirements,predict his production rate.
The values needed to determine the yarn run-in :
Lapping,Gauge E (needles/inch) ,course per cm (CPC),needle thickness (d).Calculation :

hello sir,how are you? thanks for this knowledge sharing site.i wanted to know how to calculate the yarn run in for the lycra(Stretch Yarns).since i was observing some samples and i found very less run in for lycra,also i request you to please explain the relation of pre stretch of the stretch yarn and run in for the same,and also if possible then explain about how to decide the pre stretch of the lycra while warping them.

@ Deepak,The run-in for Lycra or others elastic yarn depend of the fabric construction,whether this fabric need high stretch with low run-in or less stretch mean more run-in and also the composition between Nylon and elastic may vary.

Usually the pre-stretch and final stretch during warping process will recommend from yarn manufacture.More big yarn count the final stretch for warping will less than smaller yarn count,the pre-stretch may vary according the condition and yarn properties.

Hello Sir,First I'd like to say thanks for your great contribution. I'm newbie in this industry and self studying. Could you pls tell me how to determine or calculate the lycra and nylon composition in powernet fabric when run-in values are known.